I know there's no way to find out. I'm just thinking down another path again. I wonder if the matter at the core of a black hole maybe jiggles around? Or would it be perfectly stationary?
We the gravity in the center makes the repulsive force between atoms seem very small by compare. If they're able to freely pass through each other, then a particle's motion at the core would be very much like the old - object falling through a hole going through the center of the earth scenario.
It falls until it reaches the core, then is carried upwards a little ways by its own momentum, then falls back down again, and etc.... In the core of a black hole, I'm sure its continually hitting the speed of light and dropping to zero again.
I dont' know. Do you think that happens? Or do you figure the particles at the core eventually slow each other to a full stop?